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The correct way to define the ideas as interfaces would be as follows: interface IShape { double CalculateArea(); } interface ISquare : IShape { double Width { get; set; } } interface IRectangle : IShape { double Width { get; set; } double Length { get; set; } } This code contains three interfaces: IShape, which defines a shape; IRectangle, which describes a rectangle; and ISquare, which defines a square The IRectangle and ISquare interfaces subclass the IShape interface, indicating that an IRectangle is also an IShape The ISquare interface is separate from the IRectangle interface, because a square is not a rectangle, even though the shapes might appear similar (a square is a rectangle, but a rectangle is not necessarily a square) This separation of the square and rectangle interface illustrates that when designing interfaces, you need to focus on the specific behavior of the interface.

n the previous chapter, you implemented a selectable list of departments for the BalloonShop web site. However, a product catalog is much more than that list of departments. In this chapter, you ll add many new product catalog features, including displaying product lists and product details. Review Figures 4-1, 4-2, and 4-3 to get a feel for the new functionality you ll implement in this chapter. More specifically, in this chapter, you will Learn about relational data and the types of relationships that occur between data tables, and then create the new data structures in your database. Understand how to join related data tables, how to use subqueries, how to implement paging at the data tier level, and even more theory about T-SQL functions and techniques. Complete business tier functionality to work with the new stored procedures, including stored procedures with input and output parameters, and use simple data structures to pass requested data to the presentation tier. Create new Web Forms and Web User Controls to show your visitors details about your categories, your products, and more. Yep, that s a lot of material to get through! Take a deep breath, and let s get started!

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You don t want to focus on the general behavior The general behavior is managed when you design the classes The modeling of your real-life experiences are defined in the implementations, as illustrated by the following example class SquareImpl: ISquare, IRectangle { } class RectangleImpl: IRectangle { } The SquareImpl class implements the behavior of ISquare and IRectangle, and models real life, where a square is also a rectangle And RectangleImpl implements only the behavior IRectangle, illustrating that a rectangle can only be a rectangle and not a square Now you cannot write code where the implementation produces inconsistent results For example, the following code would not be possible..

To correct this problem, correct the contents of the Cell Reference box to reference changing cells..

Given the new functionality you are adding in this chapter, it s not surprising that you need to add more data tables to the database. However, this isn t just about adding new data tables. You also need to learn about relational data and the relationships that you can implement between the data tables, so that you can obtain more significant information from your database.

IRectangle rectangle = new RectangleImpl(); ISquare square = (ISquare)rectangle; But the following code is possible. IRectangle rectangle = new SquareImpl(); ISquare square = (ISquare)rectangle;

It s no mystery that a database is something that stores data However, today s modern relational database management systems (RDBMSs), such as MySQL, PostgreSQL, SQL Server, Oracle, DB2, and others, have extended this basic role by adding the capability to store and manage relational data So what does relational data mean It s easy to see that every piece of data ever written in a real-world database is somehow related to some already existing information Products are related to categories and departments, orders are related to products and customers, and so on A relational database keeps its information stored in data tables but is also aware of the relations between them These related tables form the relational database, which becomes an object with a significance of its own, rather than simply being a group of unrelated data tables.

Note When defining ideas, the resulting interfaces could be considered as behavior characteristics that

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